Fix global 'hours' buffer overflow#6

When loading the hours file, ntserv uses fscanf() to read play hours line-by-line into a global 'hours' buffer. Since there are 24 hours in a day, each day is an array of 24 hours. However, fscanf() also copies the terminating NUL character. This results in a buffer overflow in the default installation when parsing the last line. This fix uses fgets() to read up to 25 characters (including the trailing NUL), and then copies the first 24 characters into the global 'hours' buffer.